Engine-primer.



B. B. STUBBLEFIELD.

ENGINE PRQMER.

APPLICAHON FILED MAY 19. 19:1.

Patented Mar. 19, 1918.

3 SHEETS SHEET I.

iNVE'NTOR- ISZJYZ Me/iew A'n'oanav WITNESSES B. B. SWSBLEFIELU,

ENGINE WIMEB.

APPLJCAHON FlLi'!) an i9. 191;"

3 SHEETS-SHEET 2.

INVENTOR wlgr asses 1 ,B.

ATTORNEY B. STUBBLEFIELD.

ENGiNE PRIMER APPLKCATIGN mu) MAY 19. unit.

1,260,091 Patented Mar. 19, 1918.

3 $HEETSSHEET 3- INVENTOR 12,5. fitublefz'eld.

w, ATTORNEY UNITED STATES PATENT OFFICE BERNARD B. STUBBLEFIELD, 013' BOSTON, MASSACHUSETTS, ASSIGNOR OF ONE-EIGHTH TO MARGARET C. CONDIT, OF NORTH STOUGHTON, MASSACHUSETTS.

Enema-PRIMER.

Specification of Letters Patent.

Patented Mar. 19, 1918.

Application filed May 19, 1917. Serial No. 169,720.

To all whom it ma concern:

Be it known that "I, BERNARD B. S'XUB BLEF no, a citizen of the United States, residi g ,at Boston, and State of Massachusetts, have invented new and useful Improvements in Engine- Prilners, of which the following is a speci fication.

This invention relates to engine primers and particularly devices fog priming all kinds of internal combustion engines including those used in. connection with auto- IDObll'GS, marine vessels, the device being 4 invention is to, provide in connection with each cylinder of an internal (combustion eng'ine, a'priming unit embodyin valve mecli anism and a priming iqui expressing member, both operable under the influence of the priming liquid under pressure caused by the operation of the pump, the arrangement hem such that the valve is charged with priming liquid, shifted to its discharging position, and the expressing member. operated simulta pusly for forcing the priming liquid the respective e 'ne cylinder, all of the parts beingrestore to their initial positions automatically when the operation of the amp is terminated. With the above and other objects in view, the invention consists in the novelconstruction, combination and arrangement of parts, herein described, illustrated and claimed.

In the accompanying drawings Figure 1 is a fragmentary vertical longitudinal section through suflicient of an automobile to illustrate the priming apparatus in its applied relation thereto.

Fig. 2 is an enlarged sectional view of the pump and the reservoir.

Fig. 3 is an enlarged diametrical section th 11 one of the priming units, showing the relation thereof to one of the cylinders of the engine. I

in the countyof Suffolk Fig. 4: is a section on the line 4-4 of Fi 3.

Fig. -5 is a View looking toward one end of Fig. 3 with the adjacent head removed.

Fig. 6 is a view similar to Fig. 3 showing a modification in the form and arrangement of the valve and expressing piston.

Fig. '7 is a view form of 'the engine primer.

Referring to the drawings -A designates generallyan internal combustion engine embodyin cylinders 1, 2, 3 and 4,, and 5 re resents t e dash or instrument board 0 an automobile or motor truck.

In conjunction with each cylinder of the engine, I employ a priming nipple 5 the central bore 6 of which is in direct and constant e munication with the interior of the cyli d r and the outer, end-of which is counterbor d and internally threaded as shown at 7 to receive a backpressure check valve casing 8"whic'h is screwed into the counterbore 4 and which contains a back pressure check valve 9 coiiperatin-g with a seat 10 against which it is yieldingl held by means of a contractile spring 11 aving one end attached to the valve and the other showing another modified I The. cylinder 13 has the opposite ends internally thereof threaded to receive Thehead threaded capsor heads'16 and' l'l.

of a' service pipe 18 leading to .a source of supply for the priming liquid hereinafter articularly described, the primin liquid sing fed to the interior of the cylinder 13 by-means of said ipe 18. Mounted to reciprocate in the cy inder 13 is a piston valve 19 of hollow cylindrical formation but pro vided between the ends thereof with an imperforate head or partition 20. Mounted to reciprocate within the valve 19 is an expressing piston 21, the outward movement of which is-limited by means of a etc 22 shown in the form of a screw whic is threaded diametrically through one end of 17 has connected thereto thedischarge end against the stop 22 ton '21, the other extthe head 44 of the barrel piston valve 19. The pisingly pressed toward and y means of an expansion spring 23 one extrei'nity of which is 1ncenter of the [)IS- serted in a socket 24 in the entry of the spring bein inserted in a central socket 25 in the artition or head 20. The piston valve 1.9 is held toward the head 17 of the cylinder 13 by means of a coiled expansion spring 26 one extremity of which is inserted in a central' socket 27 in the partition or head 20, While the opposite extremity of said spring is inserted in a socket 28 in the extremity of a tensioning screw 29, the latter being threaded through a central opening 30 in the cap or head 16 and being provided with amilled head 21, the screw 29 being held when adjusted by means of a jam nut 32.

The piston valve 19 is formed in line with one side of the head 20 with an external annular groove 33 intersected by ports 34 which place said groove 33 in communication with the chamber 35 in which the piston 21 operates. The wall of the cylinder 13 is formed with a by-pass 36 which leads from. a priming liquid chamber or cavity 37 in the head 17 to the annular troove 33. This enables the priming liquid to be forced through the ports 34 into the chamber 35 from which. it is snbscqiliently expressed by means of the piston 21.

The service or feed pipe 18 connnrmicates at its receiving end with a reservoir 38 which is shown as provided with attaching lugs 39 by means of which it may be r-icrizwed, to the dash or instrument board 5. The reservoir the reciprocator ton 20 is ylel 38 is provided with a filling cap 40 to ens, 'able the priming liquid, usually asolene, to be introduced therein. 41 v pump barrel which is set at an. inclination and a portion of which is contained within the reservoir 38, another portion thereof extending beyond the reservoir 38 so as to pass through an opening in the dash or instru ment board 5. Mounted within the barrel 41 is a reciprocatory plunger head or piston 42 fixedly carried by an operating stem or plunger rod 43, the latter extending through 41 and being provided with a hand grip or handle 45 within reach of the operator in his seat. A spring 46 surrounds the pump rod 43 and serves to hold the plunger'head 42 at the inner limit of its stroke. The barrel &1 is equipped with a. spring pressed foot or admission valve 47 at the lower end thereof, said valve being held normally open by the action of the spring 48 by which it is carried, said valve 47 closing automatically during the working stroke of the pump. The barrel 41 is also provided with a vent hole 49 located in the upper part oi the reservoir 38 above the normal level of the priming liquid therein. The service pipe 18 communicates directly with the branches 18' scribed takes place.

signates a the extremityof the discharge end of the pump barrel 41. The service pipe 18 has incorporated therein a stop cook 59 and each of lhe nipples 5 is also preferably equipped with a stop cock 51, This enables the liow of priming liquid to be cut oil when it becomes necessary to make repairs at different points in the prim-- ing apparatus. The scrrirc pipe 18 is provided wi branches 18 leading to the cylindcrs 13 ot the priming units.

In order to prime the cylinders of the engine it is only necessary to give one or more strokes to the pump which as described and shown is within reach of the operator while in his seat. In each working stroke of the pump, the foot valve l? automatically closes, and pressure is put behind the priming liquid in the service pipe 18, thereof, and in the cavity or chamber 87 of the head 17 of each priming cylinder 18. This pressin-e produces a working stroke of the expressing piston 21 and at the sa me time shifts the piston valve ill so that the annular groove 88 moves out ol' irgistrywvifl' vy-pass 3 and into line wiih a port 53 in he cylin er l?- which comunlnicates directly with ulie valve casing 8. The priming liquid is thus forced. into the adjacent cylinder of the engine and immediaicl y thereafter, the piston valve 19 is re turned to the position illustrated in Fig. 3 by [he action of the spring 26, the piston 21 being returned to its initial position by means of the spring 23. In each working stroke of the pump, the operation above do- The check valve 9 pre* nu ts the return of the priming liquid and also scals the bore 6 of the nipple so as to prevent any flame from reaching the cylin der 13.

In lieu of the arrangement valve and expressing piston shown in the prccei'ling figures, the arrangement illus trated in Fig. 6 may be employed if so.de sired. Under the arrangement shown in Fig. 6, the piston valve 19 is provided with a guiding stem 54 extending therefrom to ward the head 17 of the cylinder 13, and the expressing piston. 21' is slidingly mounted upon the stem 54, being l'ormed with a central bore 55 to receive said stem. 21' is held from escaping from the stem 54: the form of a screw which is threaded into the stem 54. A spring 57 the stem 54:, bearing at one oi the piston the end of is coiled around by means or a stop 56 shown m.

1 1 The piston 3 end against the piston 21' and having its 7 other end received in an annular recess 58 in the head 20' of the piston valve 19'. The operation of the piston valve 19 and the expressing piston 21 is the same as that previously described in connection with the piston valve 19 and the expressing piston 21.

Under the arrangement illustrated in Fig. l, the priming cylinder 60 is arranged verti- T 84 and a compression relief port 85.

cally, the valve 61 is arranged slidable therein in the same manner as in the preceding figures, and the expression piston 62 being mounted for sliding movement in the chamber 63 of the valve. The lowgr end of the cylinder 60 is closed by means of a remova le threaded plug 64 while the opposite end of the cylinder is closed by a threaded plug 65 comprisin an air chamber 66 having a port 67, whic leads into the chamber 68 of the cylinder 60 into which the valve 61 works. The air chamber 66 revents the formation of an air cushion behind the valve- 61 which would interfere withthe. free operation of said valve. The return spring 69 for the valve 61, has one extremity thereof attached to the plug 65 as shown.

The cylinder 60 is formed in the wall thereof with a cylindrical bore 70 terminating at its inner end in a taper or conical va v e seat 71 in conjunction with which opcrates a check valve 72,- a portion of which is cylindrical, and a portion of which is tapered or conical as shown to fit the valve seat 21. The valve may be accurately ground to its seat by reason of the tapered formation of the inner end thereof. The outer end of the bore 70 is normally closed and tightly sealed by means of a threaded plug 73.

spring 74 is confined between the plug 72 and yieldingly holds said valve against its seat. A port 75 extends from the chamber 68 to the valve seat 71. Another port 7 6intersects the valve seat 71 and communicates with a passage 77 which leads to a three-way valve casing 78in which is mounted a three-way valve 79 having an operating handle 80. The valve 79 1s of the ta pered plug type and comprises a single port The casing 78 comprises an inlet port 82, a priming outlet port 83, a drain ort valve 79 may e turned to any one of three positions, one position allowing the priming liquid to pass directly to the engine, another position relieving the compression in the.engine, and another position permitting the priming liquid to be drained from the assage 77. The chamber formed by the ore 70 acts as an air cushion chamber, the air compressed therein by the movement of the valve 72, assisting the spring 74.- to return said valve to its seat.

Instead of using a pum as hereinabove described, compressed air rom any suitable source may be utilized to force the priming liquid under the necessary pressure into the priming cylinder.

1. The combination with the cylinder of an internal combustion engine, of a priming unit in communication therewith and embodying a cylinder, a reservoir for 'the priming agent, a feed pipe leadin from said reservoir to the cylinder of sai priming unit, a piston valve mounted to reciprocate in the cylinder of the riming unit and having a cylindrical chum or to receive the priming agent and also formed with ports eading to and from said chamber, an auxiliary lston mounted for movement in said chum er, and means for forcing the priming agent under pressure through said feed pipe into the cylinder of the priming unit, said piston valve and auxiliary piston being operable by said liquid under pressure.

2. The combination with the cylinder of an internal combustion engine, of a priming unit in communication therewith and em' bodying a cylinder, a reservoir for the prim leadin to and from said chamber an auxiliary piston mounted for movement in said chamber, means for forcing the priming agent under pressure through said feed pipe into the cylinoir of the priming unit, said piston valve and auxiliary piston being operable by said liquid under pressure, and a back pressure check valve between the engine cylinder and the cylinder of the priming unit.

3. The combination with the cylinder of an internal combustion engine, of a priming unit in communication therewith and embodying a cylinder, a reservoir for the priming agent, a feed pipe leading from said reservoir to the cylinder of said priming unit. a piston valve mounted to reciprocate in the cylinder of the priming unlt and having a cylindrical chamber to receive the priming agent and also formed with ports leading to and from said chamber, an auxiliary piston mounted for movement in said chamber, means. for forcing the priming agent under pressure through said feed pipe into the cylinder of the priming unit, said piston valve and auxiliary piston being operable by said liquid under pressure, and yieldable means for effecting a return stroke of said piston valve.

4;. The combination with the cylinder of an internal combustion engine, of a priming unit in communication therewith and embodying a cylinder, a reservoir for the priming agent, a feed pipe leading from said reservoir to the cylinder of said priming unit. a pistonvalve mounted to reciprocate in the cylinder of the priming unit and having a cylindrical chamber to receive the priming agent and also formed with ports leading to and from said chamber, an auxiliary piston mounted for movement in said chamber, means for forcing the priming agent under pressure through said feed pipe f into the cylinder of the priming unit, said piston valve and auxiliary piston being operable by said liquid under pressure, an yieldable means for effecting a return stroke of said auxiliary piston.

5. The combination with the cylinder of an internal combustion engine, of a priming unit in communication therewith and cmbodymg a cylinder, a reservoir for the priming agent, a feed pipe leading from said reservoir to the cylinder of said priming unit. a pistol valve mounted to reciprocate in the cylinderol' the" priming unit and having a cylindrical. chamber to receive the priming agent and also formed with ports loading to and from said chamber, an auxiliary piston mounted for movement in said chamber, means for forcing the priming agent under pressure through said feed pipe into the cylinder of the priming unit, said piston valve and auxiliary piston being operable by said liquid under pressure, and yiehlable means for effecting the return strokes oi said piston valve and said an iliary piston.

6. The combination with the cylinder of an internal combustion engine, of a priming unit in communication therewith and em bodying a. cylinder, a reservoir for the priming agent, a feed pi e leading from. said reservoir to the cylinc er of said priming unit, a piston valve mounted to recipro' rate in the cylinder of the priming unit an having a cylindrical chamber to receive the priming agent and also formed with ports leading to and from said chamber, an auxiliary piston mounted for movement in said chamber, means for forcinn the priming agent under pressure through, said feed pipe into the, cylinder of the priming unit, sai piston valv and auxiliary piston being operable by aid liquid under pressure, the cylinder of said priming unit being formed with a by-pass to lead the priming agent to said annular groove of the piston valve, and the cylinder of said priming unit being further iormcd With an outlet port located out of line with the discharge end of said by-pass and with which said annular groove of the piston valve is adapted to register at the limit of its working stroke.

7. The combii'iation with the cylinder of an internal combustion engine, of a priming unit in communication therewith and embodying a cylinder, a reservoir for the priming agent, a feed pipe leading from said reservoir to the cylinder of said priming unit, a'apiston valve mounted to reciprocate in the cylinder of the priming unit and having a cylindrical chamber to receive the priming agent and also formed with ports leading to and from said chamber, an auxiliary piston mounted for movement in said chamber, means for forcing the priming agent under pressure through said feed pipe into the cylinder of the priming unit, said piston valve and auxiliary piston being 0 erable by said liquid under pressure, tie chamber in which the auxiliary piston works being open at one end, and a piston stop extemliug across the open end of said chamber.

In testimony whereof I afiix my signature.

nenuann e. STUBBLEFIELD. 

